shell脚本使用tar备份

#!/bin/bash
pat="/data/wordpress"
date=$(date +%F)
pat_tar="/data/bak"
tar_pat="/data/bak/wordpress_$date.tar.gz"
if [ ! -d $pat_tar ]; then
    mkdir $pat_tar
fi
if [ ! -e $tar_pat ]; then
    tar zpPcf $tar_pat /data/wordpress
    find $pat_tar -mtime +7  -name *.tar.gz -exec rm -rf {} \;
fi